Joined: May 2008
Posts: 955
Likes: 53
From: Toronto, Canada
Bikes: (shortlist) Cyclops, Marinoni, Mariposa, Air Firday, Pocket Rocket Pro, NWT, SLX Fuso, Claude Pottie (France) x3, Masi Team 3v, Lemond Zurich, Bianchi OS
and then of course, before posting to this forum and wasting everyone's time, I could have gone to the Campagnolo website and perused the tech documents where it is clear that a Chorus headset from about this era (2000) takes 3/16 bearings on the bottom and 5/32 bearings on the top.
FYFM